Edge-bending machine.



C. REHBElN.

EDGE BENDING MACHINE.

APPLICATION FILED JUNE25. m1.

Ptented July 16, 1918.

3 5HEET$-SHEETI 0. REHBEIN.

EDGE BENDING MACHINE.

APPLICATION FILED JUNE 25. 1917.

Patented July 16, 1918.

3 SHEETS-SHEET 2.

alto Mim C. REHBEIN.

EDGE BENDING MACHINE.

APPLICATION FILED JUNE 25. 1917.

1,272,999, Patented July 16, 1918.

3 SHEETS--SHEET 3.

UNITED STATES PATE onnion.

CONRAD REHBEIN, OF DETROIT, MICHIGAN, ASSIGNOR T0 HAYES MANUFACTURING00., OF DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN.

EDGE-BENDING MACHINE.

Specification of Letters Patent.

Patent ed July 1c, 1913.

Application file iane 25, 1917. Serial No. 176,708.

pertains to make and use the same, reference being had to theaccompanying drawings, which form a part of this specification.

This invention relates to metal bending machinery and especially what isknown as an edge-bender; that is to say, a machine which is designed tobend sheet metal in the plane of the metal, which of course; isordinarily very diflicult as it has its maximum strength in thisdirection. i

In the drawings,- 1

Figure 1 is a side elevation of the machine with some of the partsbroken away.

Fig. 2 is a plan view.

Fig. 3 is an end elevation.

Fig. 4 is a section of a part of one of the rolls and the forming blockas used.

Fig. 5 is a sectional detail of the rolls.

I a designates the frame; I) the speed reduction gears; d the driveshaft; 0' the driven shaft provided with a beveled pinion that mesheswith the oppositely facing eveled pinions g, h loosely running on thedrive shaft d. The jaw clutch z serves to connect either one of theseloose pinions g and h to the drive shaft, and therefore, acts as a powerreversing clutch which is controlled from a handy position near the topof the machine by reason of the bent lever j and the link 70.

It will be noted that the driven shaft 0 is journaled vertically in theframe and car-' ries at its top a roller Z which has a pair of annulargrooves m in its periphery adapted to receive the metal strip or work n;This work is what is known as a stiffening for an automobile fender.These strips are cut out straight from the stock and then bent edgewiseto the desired contour of the fender, which may be a double reversedcurve if a front fender, and an almost semi-circular curve if a rearfender. However, in bending for a reverse curve, two forces are used,one after the other, as the strips have to be laid in the forming blockwith the beads and wires on the outside instead of on the inside asshown in Fig. 4. The forming roll has also to be changed. Cutting thesestrips from straight stock is, of course, a great saving in materialfrom the practice of cut ting them out in a curved-form.

The forming block 0 (when used for rear fenders) ma be of the curvaturedesired for the finis ed strip and, of course, may be varied withinquite broad limits. In cross sect on it may be U shape (Fig. 4). Theuprights of the U each carry one stifi'ening strip. The folded-over edgeof the stiffen- 'ing strip which is intended to be rolled in withthe-main web of the fender, turns over to the outside of the upright ofthe U. The head of the strip which carries the stiffening wire alreadyrolled in, rests at the bottom of the U and a small protuberance 9 formsa seat on either side of the protuberance for each of these beads. Orwhen bending in the opposite direction the U-like pushing should be onthe roll and the complementary pushing on the form. This can beaccomplished by changing the roll and changing the form.

' It will be seen that when the forming block 0 is brought intoengagement with the form roll Z that the formin block and the form rolleach serve to compitely incase the cross sectional portion of thestifl'ening strip in contact with the two members so stifi'ening strip,no distortion of the stock can occur. In Fig. 2 it will be seen that theforward end of the stifiening stri is .clamped to the forming block bythe 0 amp 1'. The forward end of the forming block may be put betweenthe form roll Z and the guiding rolls, which is a roll having a plainperiphery and a pair of collars t, t, for enaging about the formingblock. When the forming block with the stiffening strip clamped in placeis put between these two rolls, the rolls are drawn together by turningthe lever M, which is journaled in the journals v, c, of the frame a-This lever is connected with a rock shaft y that in turn connectsrigidly with the lever arm 2- At the end of this lever arm 2 a link 1 ispivoted which is connected to the bifurcated end of the sliding rod 2that connects with the slide 3 through the coil spring 4. The slide 3journals the plain roll 8- In the standard is journaled the doubleroovedroll Z. Now obviously by throwing t e lever shown in Fig. 1 awayvfromthe viewer, the

slide 3 can be made to move. away from the standard 5 so as to separatethe rolls, and

viewed in cross section as shown'in Fig. 4.

Consequently when the two rollsis and Z are brought together by throwingthe toggle arms of the control apparatus, the spring will securely holdthe rolls and form together and the metal is completely socketedi in therestraining walls of the form and the forming roll 30 that it is obligedto follow the contour of the form as the same is pulled through therolls by the driving of the roll L which as already shown, is connectedup with the power'by a. large speed reduction gearing. The other rollis'an idler to carry the form through the rolls without friction.

By using the i ler roll differential speed of the rolls can be securedwithout difi'erential gearing, which is quite an advantage anddifi-erential speed is necessary because of the curvature of the form.

' What I claim. is:

1. In an edge bending machine for bending stiffening strips forautomobile fenders and similar strips, the combination of a drivingroll, an idler roll, means for drawin the said roll toward and away fromsaid driving roll including a spring for allowing relative movementafter the rolls are in a set position and to furnish pressure forfrietional driving of the roll and devices passing between the rolls,and a formin block having a longitudinal contour curve to the benddesired for the, strip, the peripheries of the said block and one of therolls being shaped to completely ensheathe and restrain all the sides ofone or more strips, said idler roll'and forming block being drivensolely by friction.

2. In an edge bendin I machine, the combination of a driven r01 an idlerroll opposite the driven'roll and both provided with grooves having.uninterrupted surfaces, a longitudinally arcuate forming block havingone or more grooves in one face'and propelled through the rollers solelyby friction, and means for vyieldingly pressing the rollers and formingblock together.

In testimonywhereof I sign this specification.

CONRAD REHBEIN.

